FEATURES DESCRIPTIO TYPICAL APPLICATIO. LM / LM /LM Micropower Voltage Reference APPLICATIO S

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1 Micropower Voltage Reference FEATRES 2µA to 2mA Operating Range Guaranteed % Initial Voltage Tolerance Guaranteed Ω Dynamic Impedance Very Low Power Consumption APPLICATIO S Portable Meter References Portable Test Instruments Battery-Operated Systems Panel Meters Current Loop Instrumentation DESCRIPTIO The LM is a two-terminal band gap reference diode that has been designed for applications which require precision performance with micropower operation. The device provides guaranteed operation specifications at currents as low as 2µA. The nominal voltage is 2.5V with both % and 2% tolerances available. Some additional features are: maximum dynamic impedance of Ω, low noise and excellent stability over time and temperature. The advanced design, processing and testing techniques make Linear s LM a superior choice over previous designs. A circuit for cold junction compensation of a thermocouple is shown below. For applications requiring guaranteed temperature drift, see the LT34 data sheet., LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATIO Thermocouple Cold Junction Compensator Reverse Voltage Change I Q 5µA 6 55 C T A +25 C 2 MERCRY CELLS 2.6V 6k M LM TYPE K k.. ZERO 95Ω + METER V IN LM334 V 45Ω R SET 2k k ADJST FOR 2.7mV AT 25 C ACROSS 45Ω LM TA OTPT VOLTAGE CHANGE (mv) REVERSE CRRENT (ma) LM TA2

2 ABSOLTE AXI RATI GS Reverse Breakdown Current... 3mA Forward Current... ma Operating Temperature Range LM (OBSOLETE) C to 25 C LM C to 85 C LM C to 7 C (Note ) Storage Temperature Range LM (OBSOLETE) C to 5 C LM C to 5 C LM C to 5 C Lead Temperature (Soldering, sec.)... 3 C PACKAGE/ORDER I FOR BOTTOM VIE H PACKAGE 2-LEAD TO-46 METAL CAN T JMAX = 5 C, θ JA = 44 C/, θ JC = 8 C/ ATIO ORDER PART NMBER LM85H-2.5 LM285H-2.5 LM385H-2.5 LM385BH-2.5 (NOTE 3) BOTTOM VIE Z PACKAGE 3-LEAD TO-92 PLASTIC T JMAX = C, θ JA = 6 C/ ORDER PART NMBER LM285Z-2.5 LM385Z-2.5 LM385BZ-2.5 (NOTE 3) OBSOLETE PACKAGE Consider the S8 or Z Packages for Alternate Source TOP VIE S8 PACKAGE 8-LEAD PLASTIC SO T JMAX = 5 C, θ JA = 22 C/ (DO NOT SE) Consult LTC Marketing for parts specified with wider operating temperature ranges. ORDER PART NMBER LM285S8-2.5 LM385S8-2.5 LM385BS8-2.5 S8 PART MARKING B 2

3 ELECTRICAL CHARACTERISTICS LM85-2.5/ The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T A = 25 C. (Note 2) LM85-2.5/ LM /385B-2.5 SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX NITS V Z Reverse Breakdown Voltage T A = 25 C, 2µA I R 2mA LM85-2.5/ V LM V LM385B-2.5 (Note 3) V V Z Average Temperature Coefficient 2µA I R 2mA (Note 3) 2 2 ppm/ C Temp I MIN Minimum Operating Current T MIN T A T MAX µa V Z Reverse Breakdown Voltage 2µA I R ma I R Change ith Current T A = 25 C. 2. mv T MIN T A T MAX mv ma I R 2mA T A = 25 C 2 mv T MIN T A T MAX 2 25 mv r Z Reverse Dynamic Impedance I R = µa (Note 4) T A = 25 C Ω T MIN T A T MAX.5.5 Ω e n ide Band Noise (RMS) Hz f khz, I R = µa 2 2 µv V Z Long Term Stability T A = 25 C ±. C, I R = µa 2 2 ppm/khr Time Note : Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: All specifications are for T A = 25 C unless otherwise noted. For the LM T MIN = 55 C and T MAX = 25 C. For LM , T MIN = 4 C and T MAX = 85 C. For LM , T MIN = C and T MAX = 7 C. Note 3: For very low initial tolerance, consult LT4 data sheet. The LT4 is a low cost, pin for pin substitution device. For guaranteed temperature coefficient consult the LT data sheet. Note 4: Guaranteed but not tested. 3

4 TYPICAL PERFOR A CE CHARACTERISTICS Reverse Characteristics Forward Characteristics Temperature Drift C TO 25 C T A = 25 C 2.52 REVERSE CRRENT (µa) FORARD VOLTAGE (V) REFEREE VOLTAGE (V) REVERSE VOLTAGE (V) FORARD CRRENT (ma) TEMPERATRE ( C) LM TPC LM TPC2 LM TPC3 DYNAMIC IMPEDAE (Ω) Reverse Dynamic Impedance Reverse Dynamic Impedance Noise Voltage f = 25Hz 55 C TO 25 C DYNAMIC IMPEDAE (Ω) k k T A = 25 C I R = µa NOISE (nv/ Hz) REVERSE CRRENT (ma). k k k M FREQEY (Hz) k k k FREQEY (Hz) LM TPC5 LM TPC5 LM85-2.5M TPC6 INTEGRATED NOISE (µv RMS ) Filtered Output Noise ma R C k RC LO PASS k CTOFF FREQEY (Hz) k LM TPC7 VOLTAGE (V) V Response Time OTPT 24k V IN V OT INPT 5 TIME (µs) LM TPC8 4

5 SCHE ATICDAGRA I + 7.5k Q3 Q4 Q2 2k Q3 Q7 2pF 2pF Q Q 6k Q 5k 5k Q2 Q5 Q9 3k k 5Ω Q6 Q8 Q4 6k 5k LM SD PACKAGE DESCRIPTIO H Package 2-Lead and 3-Lead TO-46 Metal Can (Reference LTC DG # ) REFEREE PLANE ( ) ( ).5 (2.7) MIN.6.2** ( ) DIA.85.5 ( ) *.25 (.635) MAX.5 (.27) TYP (.94.68). (2.54) TYP PIN 45.5 (.27) TYP FOR 3-LEAD PACKAGE ONLY (.7.29) H2/3(TO-46) 98 * LEAD DIAMETER IS ONTROLLED BETEEN THE REFEREE PLANE AND.45" BELO THE REFEREE PLANE.6.24 ** FOR SOLDER DIP LEAD FINISH, LEAD DIAMETER IS (.46.6) OBSOLETE PACKAGE 5

6 PACKAGE DESCRIPTIO S8 Package 8-Lead Plastic Small Outline (Narrow.5 Inch) (Reference LTC DG # 5-8-6).89.97* ( ) ( ).5.57** ( ) SO ( )..2 ( ) 45 8 TYP ( ).4. (..254).6.5 (.46.27) * DIMENSION DOES NOT ILDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED.6" (.52mm) PER SIDE ** DIMENSION DOES NOT ILDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED." (.254mm) PER SIDE.4.9 ( ) TYP.5 (.27) BSC 6

7 PACKAGE DESCRIPTIO Z Package 3-Lead Plastic TO-92 (Similar to TO-226) (Reference LTC DG # 5-8-4).6 ±.5 (.524±.27) DIA.8 ±.5 (4.572 ±.27).8 ±.5 (4.572 ±.27).9 (2.286) NOM.5 (2.7) MIN.5 ONTROLLED (.27) LEAD DIMENSION MAX 5 NOM.5 (.27) BSC.6 ±.3 (.46 ±.76).6 ±. (.524 ±.254).4 ±. (3.556 ±.27).5 ±.2 (.38 ±.5) Z3 (TO-92) /.4 ( /.) 2 PLCS TO-92 TAPE AND REEL REFER TO TAPE AND REEL SECTION OF LTC DATA BOOK FOR ADDITIONAL INFORMATION NOM Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of circuits as described herein will not infringe on existing patent rights. 7

8 TYPICAL APPLICATI O S 9V 22k LM334 V + 3.7V V + 3V R 2.7k 2.5V LM V LM REFEREE FROM A 9V BATTERY OPERATION OVER A IDE SPPLY RANGE LM TA3 RELATED PARTS PART NMBER DESCRIPTION COMMENTS LT634 Micropower Shunt Voltage Reference.5% Initial Accuracy, ppm/ C Maximum Tempco Output Voltage:.25V, 2.5V, 4.96V and 5V 8 Linear Technology Corporation 63 McCarthy Blvd., Milpitas, CA (48) FAX: (48) fc LT/CP 8.5K REV C PRINTED IN SA LINEAR TECHNOLOGY CORPORATION 992

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